|
GEC Toplite MBFR/U Mercury Reflector |
Firstly, the lamps provide good optical control but without the requirement for expensive reflector systems. Like most other mercury reflector lamps, the glass is acid-etched to produce a diffuse front window. The primary purpose of this is to homogenise the colour throughout the beam, since the arc tube radiates the classic blueish-green light while the phosphor coating around it adds the red component. Some competitive lamps make use of a clear front which does deliver a much narrower beam with better optical control, but there is some lack of colour uniformity in the beam.
The second principal advantage of the reflector-style lamps is that optical performance is not restricted by the build-up of dirt or corrosion on reflecting surfaces, as is the case with conventional luminaires. With each new lamp comes a new optical system and there is, of course, no need for expensive cleaning maintenance of the luminaire on a regular basis.
The use of MBFR therefore reduces both capital installation costs, and maintenance / cleaning costs in all industrial applications which can accept the broader polar intensity distribution of this lamp over a high bay luminaire.
Technically, the construction of MBFR is similar to the standard MBF design. It employs the same Truelite yttrium vanadate phosphors as standard lamps, with an undercoat of titanium dioxide before the phosphor layer acting as a reflective surface which also transmits some upward light.
| Manufacturer: | The General Electric Company of England Plc. | |
| Lamp Power: | 125 Watts | |
| Lamp Current: | 1.15 Amps | |
| Lamp Voltage: | 125 Volts | |
| Cap: | E27s/27 nickel plated | |
| Bulb Finish: | YVO4:Eu phosphor with TiO2 reflector, diffuse front | |
| Bulb Type: | ER-125 | Borosilicate |
| Overall Length: | 292 mm | |
| Light Centre Length: | 178 mm | |
| Electrodes: | Backwound thoriated | Triple carbonate emitter |
| Atmosphere: | Inner: Argon | Outer: Nitrogen |
| Luminous Flux: | lm @ 100 hrs | lm @ 3,000 hrs |
| Luminous Efficacy: | lm/W @ 100 hrs | lm/W @ 3,000 hrs |
| Colour Temperature & CRI: | CCT: | CRI: |
| Chromaticity Co-ordinates: | CCx: | CCy: |
| Burning Position: | Universal | |
| Rated Life: | 10,000 hours (to 70% survival) | |
| Warm Up / Re-strike Time: | ||
| Factory: | Shaw, England | |
| Date of Manufacture: | February 1972 | |
| Original / Present Value: | ||
